Manufacture of hollow bodies from quartz



UNITED STATES B EN OFFICE.

FRANZ WOLF-BURCKH-ABDT, or BIEBRICH. GERMANY.

MANUFACTURE OF HOLLOW BODIES FROM QUARTZ No Drawing.

lie it known that I, FRANZ \YULF-Bl'lttlb tunn'r, ehemist, a subjeetof the King M Prussia. and resident of Biebrielt-on-the llhine, Gernnurv, have invented eertain new and useful Improvements in the M nufaeture ot' llollow Bodies from Quartz, ot which the following is a speeitieatitm.

This invention relates to an improved process for manutaeturing and shaping hol low bodies from quartz by losing the quartz. sand or siliea in an eleetrie t'urnaee.

lleretot'ore it has been proposed to manut'aeture hollow bodies of quartz by packing the siliea around an eleetrieal resistanee core and heating the eore by the passage of an eleetrie eurrentso as to bring the material to a plastie and agglomerate state. By this means tubular bodies are obtained after removing the eore either while the mass is in a plastie state or after the mass has set. The tubular bodies were then e.\'- panded by blowing air or gas thereinto under pressure. It has also been proposed t manutaetul'e hollow bodies in a similar manner by fusing a quartz mass on'a perl'orated plate' and blowing air or gas through the 'pert'oratitms.

The present invention has for its object to t'aeilitate the umnut'aeture. of such hollow bodies and for this purpose a greater width or diameter-is imparted to the hotlow bodies from the eonnneneeutent by heating the eore at the eonilnent'eu'ient of the proeess to sueh a teurperature (viz. about Qtltltl" t.) that th siliea around the eore volatilixes and subliines between the part-ieles ot' siliea more removed l'rom the eore. liy this means an outer. layer ot' siliea of better eondnetivit'y is formed and thus the agglomeration and fusion ot' this la ver t aeilitated. tlwing to the fusion and agglomeration a onsiderable deerease in the Specification of Letters Patent.

Patented J itly 9, 1912.

Application filed December 23. 1911. Serial No 667,446.

volume. of the mass ttlktfh' place so that a hollow body is formed a ('ertain distance from the eore (about ti or '4" mm. therefrom) by the eontraetion ot' the mass. The hollow bodies thus obtained are of greater diame ter than is the ease in previously known proeesses and these hollow bodies may be more eonveniently-and easily worked into a. further state.

l. The proeess for the manufm'ture of hollow bodies from liea which eonsists in fusing a mass of siliea.around an electrical resistanee eore by heating the resistance rare from the e unmeneement of the proeess to sueh a temperature that the silica around the eore is volatilized and sublimes in the siliea more removed front-the eore, -whei'ement of the proeess to a'vtemperature of about .3000 (1., so that the silica around the core 18 volatthzed and sublunesm' the stltea more removed from thee-ore, whereby the siliea more removed from the core' is rendered more conductive and thus more easily broughtto agglomeration and fusion whilt the. volume of the mass decreases so as to form a hollow body around the core.

[a witness whereof I have hereunto set my hand in the present-e of two witnesses.

I It .-\NZ '0! ,F- BURCKHAR DT.

\Vitnesses I I Kt'i'rv OFF, Jam Gnuxn. 

